separate main window and main view
separate main view and composition view
separate main panel from main view
make main view a vertical splitter
add visibility identifier for composition view
support composition visibility in visibility manager
implement toggle button for composition visibility
add composition toggle button to main panel
make composition view follow active visibility setting
Merge pull request #167 from cyberixae/fix_layout

Add separate composition section to main window.
Add external dependency checking.
Ignore build configuration output in version control.
Add installation prefix command line argument, prepare code for building libkunquat and examples.
Compile libkunquat translation units.
Link libkunquat library.
Build and run libkunquat tests.
Fix building of libkunquat tests with memory debugging.
Rename build.py to make.py in order to avoid file prefix collisions.
Move external dependency testing into a separate module.
Add a remark of a gotcha.